| Comparative evaluation of pyrethroid insecticide formulations against Triatoma infestans (Klug): residual efficacy on four substrates. | |
| | |
MedLine Citation:
|
PMID: 14762528 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
We investigated the residual efficacy of four insecticide formulations used in Chagas disease vector control campaigns: cyfluthrin 12.5% suspension concentrace (SC), lambda-cyhalothrin 10% wettable powder (WP), deltamethrin 2.5% SC, and 2.5% WP on four types of circular blocks of wood, straw with mud, straw with mud painted with lime, and mud containing 5% of cement. Three concentrations of these insecticides were tested: the LC90 (previously determined on filter paper), the double of the LC90, and the recommended operational dose. For each bioassay test, 15 third-stage nymphs of Triatoma infestans (Klug) (Hemiptera: Reduviidae) were exposed for 120 h to each treatment at 24 h, 30, 60, 90, and 180 days post-spraying. Mortality rates, moulting history and behaviour were recorded at 24, 48, 72, and 120 h of exposure. Mortality rates were highest during the first 30 days post-spraying. Highest mortality rates (above 50%) were observed for deltamethrin 2.5% SC and lambda-cyhalothrin 10% WP on wood blocks up to three months post-spraying. Mud was the substrate on which treatments showed lowest persistence, with the other two substrates showing intermediate residual efficacy of all treatments. During the first 30 days WP formulations were not as effective as SC flowable formulations but, overall in the longer term, WP gave grater mortality rates of T. infestans nymphs exposed at up to six months post-spraying. Porous surfaces, especially mud, showed most variability presumably due to absorption of the insecticide. In contrast the less porous surfaces (i.e. wood and lime-coated mud) kept mortality rates high for longer post-treatment, irrespective of the insecticide concentration used. |
| | |
Authors:
|
Antonieta Rojas de Arias; M J Lehane; C J Schofield; Alain Fournet |
Related Documents
:
|
15562958 - Susceptibility status of japanese encephalitis vectors in kurnool and mehboobnagar dist... 2959388 - Measurement of mortality from neonatal tetanus in burma. 18652978 - Heterogeneity in cause-specific mortality according to birthplace in immigrant men resi... 11623928 - Patient pathways: solving the problem of institutional mortality in london during the l... 21375668 - Optimal gestational age of delivery to decrease neonatal morbidity in preterm pregnanci... 22595188 - Physical growth and cognitive abilities in concordant versus discordant birth weight tw... |
Publication Detail:
|
Type: Comparative Study; Evaluation Studies; Journal Article Date: 2004-01-07 |
Journal Detail:
|
Title: Memórias do Instituto Oswaldo Cruz Volume: 98 ISSN: 0074-0276 ISO Abbreviation: Mem. Inst. Oswaldo Cruz Publication Date: 2003 Oct |
Date Detail:
|
Created Date: 2004-02-05 Completed Date: 2004-03-25 Revised Date: 2006-11-15 |
Medline Journal Info:
|
Nlm Unique ID: 7502619 Medline TA: Mem Inst Oswaldo Cruz Country: Brazil |
Other Details:
|
Languages: eng Pagination: 975-80 Citation Subset: IM |
Affiliation:
|
Departamento de Medicina Tropical, Instituto de Investigaciones en Ciencias de la Salud, Universidad Nacional de Asunción, Asunción, Paraguay. arias1@telesurf.com.py |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Insect Vectors* Insecticides* Nitriles Pesticide Residues* Pyrethrins* Time Factors Triatoma* |
| Chemical | |
Reg. No./Substance:
|
0/Insecticides; 0/Nitriles; 0/Pesticide Residues; 0/Pyrethrins; 52820-00-5/decamethrin; 68085-85-8/cyhalothrin; 68359-37-5/cyfluthrin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Screening of Brazilian basidiomycetes for antimicrobial activity.
Next Document: Activity of Euphorbia splendens var. hislopii N.E.B. (Euphorbiaceae) latex against Lymnaea columella...